How to split a compressed file?

I have a 44GB 7z compressed file that I compressed with lzma2 and it took around 11 hours (original file is a text file of 285GB). 7z a -t7z Files.7z -m0=lzma2 -mx=9 -aoa So, what I want is to do is to split the file without re-compressing it, to be able to upload/download over simultaneous connections How would I split and join such a file without going through the 7z recompress process again?